Port some of the base system to FreeBSD. Extracted from...

base/base_paths.h

 // Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef BASE_BASE_PATHS_H_
 #define BASE_BASE_PATHS_H_
 
 // This file declares path keys for the base module.  These can be used with
 // the PathService to access various special directories and files.
 
 #include "base/basictypes.h"
 #if defined(OS_WIN)
 #include "base/base_paths_win.h"
 #elif defined(OS_MACOSX)
 #include "base/base_paths_mac.h"
-#elif defined(OS_LINUX)
+#elif defined(OS_LINUX) || defined(OS_FREEBSD)
 #include "base/base_paths_linux.h"
 #endif
 #include "base/path_service.h"
 
 namespace base {
 
 enum {
   PATH_START = 0,
 
   DIR_CURRENT,  // current directory
   DIR_EXE,      // directory containing FILE_EXE
   DIR_MODULE,   // directory containing FILE_MODULE
   DIR_TEMP,     // temporary directory
   PATH_END
 };
 
 }  // namespace base
 
 #endif  // BASE_BASE_PATHS_H_